package chapter02;

import java.util.Scanner;

public class Training09 {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        System.out.println("请输入班级人数");
        int num= sc.nextInt();
        double[] score=new double[num];
        int gt80=0;
        int gt70=0;
        int gt60=0;
        int lt60=0;
        double sum=0;
        for (int i = 0; i <score.length ; i++) {
            System.out.println("请输入学号是"+(i+1)+"学生的成绩：");
            score[i]=sc.nextDouble();
            sum=sum+score[i];
            if (score[i]>=80){
                gt80++;
            }else if (score[i]>=70){
                gt70++;
            }else if (score[i]>=60) {
                lt60++;
            }else if (score[i]>=0){
                lt60++;
            }else {
                System.out.println("第"+(i+1)+"成绩格式错误");
            }
        }
        double avg=sum/score.length;
        System.out.println("全班平均成绩为:"+avg);
        System.out.println("成绩大于80分:"+gt80);
        System.out.println("成绩大于70分:"+gt70);
        System.out.println("成绩大于60分:"+gt60);
        System.out.println("成绩不及格人数:"+lt60);
    }
}
